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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01003dd007ef4dd9c275f0f6de80550bccb0f063a6867f339ab35849d37ca809' 
  AND token = 'UwCgyMeqNBzM8Odz+u0zdzAuF3NP1puGXW+C9yh4OnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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