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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67bece8215d1e11a2d31bcff0af8af6b30d040d87504c19618ba88e340ebfe6' 
  AND token = 'QJ0AE/2FbuFgs1OUuY4d26S48XBhNCSXRa7+rAs6Fpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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