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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37ae201408978c6a56502494dc08a3642866a37047f0db566b1db0f0fb2c890' 
  AND token = 'lIGkra6n4zXwhrX49SMTnGCBCBEz9YPxs6kBRuCg4wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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