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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3646ba94ab529d9a22e46eae4daf76d3b6d43507a8319f17257da3eae9fbd6' 
  AND token = 'xbfUCpmtAMJCziMzn3AaVjr0tg6UOk8Kylm+ur6ufh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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