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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe2fb7efc2a6c475c2efa286f91165b87655cf98f0e6b844018fb66dee65da8' 
  AND token = 'rG1eH9FxZ1e1DaUscN4srky7SJHcoaS+15KFr8xv6J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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