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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b406e3acd97e67350c937d81be6038815ade98118c450ec932b5897930a04d8' 
  AND token = 'yAYDJUgjP9s3N7JOuhGlR+S6VJek9yTbqJSDo1Ow+RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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