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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08781a199663815d97005998e585e1b364b82c485a7793d02483600af7108862' 
  AND token = 'C6STzY8vBN8ZorJ0nHVv9m3vVXwSAguZk+lgL+EQHu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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