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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c366a6b50a93aee6f8863eb10d44f8355e761fc9a0011ec6020e53e7cf4c18a3' 
  AND token = 'v7Q2mZe4M/9oZIRPvf+Q+4FNPmrkg+CYHKDrKKdtL/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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