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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180e8057119dfba909a55e73b10c4f50a22fd7c2c1d977d78e3da7f350c78257' 
  AND token = 'Ny3H6ril108AMjnLOzfes9xceFYuu6qphfOVLKB+FxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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