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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ed3c2e28f673f49b4e544eb703ca1b75ea921e883873ca3ee421abea57be41' 
  AND token = '2W59hp8PyOnugscW6a0pWSy9ASCl23LRxKo3gsucaZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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