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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15c261a16738c468f25d76870387815c879bc38e031411d3eb89ba8b43cbc7b' 
  AND token = 'ak9NB2i29rrbXVq/O4lgYsVH8dRsq2jdIVezWWX3Mw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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