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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53027887002c2e19c7bfdcd1cf383012ca7c2c164ab1fe5cac029642f6364821' 
  AND token = '6Mi+Q8/4HTAe2O6AdYj6qJXd/FWhYLhYDMvMt+vpdAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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