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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898c30ba7735b62dc4b188dec0a0bca30fdb399388cda0f5b3f00945d38c3433' 
  AND token = '+45csPDkIIUIB1LK8eZvXRG1lrHJmVrVv4bD7ZOJ6zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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