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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d2a0e6d23e37aa70cee4e2b50c54a37d57a3c59ab56f5395e9ec64185cc830' 
  AND token = '6YPkN0SLjnM7aV7vijCaSJa/XGoU5LW6mJo2AdpyBCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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