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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd568ae4d857bf4f1631c4a84179c78551c7cfac6a3d9bcdf7b37aadab7c75a72' 
  AND token = 'q7RK3lZpCA0ltY2RJIhEVE/W07VtgklqVbVJBMkq8jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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