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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26497b47fc5066f9c7f1ae646bcc25d0de0b53cc6b3c50919c274b6a8792daac' 
  AND token = 'i6Du5Q/QD/QYT70rXidpAjwhhkwZLvexkrad31Ij16U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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