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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3593e0d7b31b3c58587f8a767dc28083dc5c3230ade1ab7a45c6661f52c8741' 
  AND token = 'ikmVFmltuF/oTiC1ZSC4Qu2rq22/TaxJjYOMv4hyn88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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