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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5002067864d9f2108e6a962b30f11c388f187f89fc0f4556ad052a0ae74a17' 
  AND token = 'Zpkx0AkEFoEgasau6JwzwN3L66YZcyRAvnHHUjVn08U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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