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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c182bbd12fdfc2d1fddb47d3f17be2bb5ca397c840c13c90edc48c67ba7f82' 
  AND token = 'P2TqQUJ2hrrT8IFL06QA1Ove96awUp76d8u+5U9sU5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}