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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddb8e4ef30099898cac9604da5436bb653d9439792205a1d013246025fa8fbf' 
  AND token = 'eU95Or6sYWEgbHdBi9PuJeZMyjRaP3u2bGebKwCesPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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