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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedf145a045eed167cdeb80f8e4822ec5249582f28feaf8ca64289c96902dbed' 
  AND token = 'TmF7vYNvJSL84gbkD0eSMStT6LHcnQtLYIGYT7UK6Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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