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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221bcda31cacb620e2ae3b593fcc709cb90848a90ae7a982d0c8d86f15c4d839' 
  AND token = 'hukNIikbvos6RJb0VxO+4RHUsvDKKtUiuMi/M+4esYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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