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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb627cdc850f0f0c609617b840e265e22fe28a1f230c8a7dd93117e2d217cc34' 
  AND token = 'TbZ4Ksjsr4585vT1L4CCz9Q3JvzwBI6KrWWEy653YxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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