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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45251dc24e29921492a32a425fc73ed2793ca544f566a0c972f8de19b05a1847' 
  AND token = '8ce5iLn0F2gHNZ/+XEJj72ThAg0UDgXnlJRtfhEljH4=' 
  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"
    }
  }
}