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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8587f38aa552b62c9ce0942bccb7764f01f027dca2b6799252eae553b501e5e0' 
  AND token = 'bmOFvk6OPC4aRGOCEVv0pn9jgwSgGwqoynY3YikejLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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