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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a94255087e9f59b74c73bd9984a0247362ad9068ae4496981ed74b18d359063' 
  AND token = '9iwM8nRF1EC1YEEWFAyF4PPI/olw0FCMyeWeaIG9RzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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