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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f870136187dd777352ca5a8a796adfe6da3e9e3ecd4cd7efc04bffa1b67fe8f3' 
  AND token = 'KIi9N/VPPUIk9smT7B2fP5G49sBQS071Ml6K+0RJ3mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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