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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0312f2e17e6badd2b4ebe9d9afa1506af125f722e211ed3cd96d20d38fc5c3ed' 
  AND token = 'btiihdcKdKEmMfxxieFgcYsYtSrPScAhg9XG0HcOLwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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