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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171beb124d2f95b8a74462639bd6f9b67e0004be178ebadf94974113722f3f46' 
  AND token = 'whmtF1J+e9VvzCw1AH1DOHKlXpHQSwtltvognEJNhJA=' 
  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"
    }
  }
}