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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e795438da625ee3d669c4d28eb5461cdf59d99f7469823fd9530c24b8354338' 
  AND token = 'XGRzVU2OFEm9l2aFzTrUrjYbo5ruOFdppO8EGv6MjDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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