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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f64e91a0631243c73ae3dc23d1bde5f54ac7fce4cf499bcc2dfaaff61211467' 
  AND token = 'xSbTAns9BPH3apSNt70vH3zqcVfImiao5MpF3sPK2fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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