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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b113342fd8d6d084907e0d449fe2a313888639d4f3108356ac32e2fe6e3af1c' 
  AND token = 'xKG7jQPU3DS9w9zGWW2T9kuwBUYJ27r75BhiuzI4slU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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