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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0f56be4ebf25e52b1329850e8507c5c5dea96caaab83cb9db18ec48f6d91c4' 
  AND token = 'UachRALk8J/tjrDmv/K0xeR1BaPhIetBRBTqFf3Kj80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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