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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ae981b4413334b0016a6ca1530620325e4f25ade65750363502cc6a4febbd0' 
  AND token = 'E0vF31srsjeuH/1lS1GAyHuIAb8N7Q9xt6Ro845WYkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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