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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b108ec7abd9a20bb6402b966e981719048eb60b4ac4af0118b4d22d2d8404c25' 
  AND token = '4Dq8ZB2+mqNQIciDRH2imOjBqge1viOFZBYyoy3NmFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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