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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e59a41223ffd14725b806b98e9f81044d73aa59e82cdcbb73b6c53a3df63696' 
  AND token = '50X7JqEOwwCWPnmDAnRrEk9l5LLTyXML/iSGwMdWkzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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