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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30c98c3374efc72e33b663bfbfe789cae757e8a29e7bfb575683d81115001f2' 
  AND token = 'zFYZKLfHVNVgHTReOmxuC7PR+5ol4XS3zC9V+11E4Rc=' 
  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"
    }
  }
}