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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a428a65139ed6342531117e5c196875d1f2aee06b0d9276330eaca9839b60cf2' 
  AND token = 'BcUCaVzv7ExQmXbpNLaI0psFCvIE8+ng3+o7OGD0zlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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