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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e07b4d29e8e095f7dc589f66436823533de34e3d194cab8de694f847ebea19e' 
  AND token = 'tp/9JJGR/kxkaWt8YgxoT5XsErpMPs+J9tgunCifQkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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