SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08811a0bd01f0d8e676205affeb878f27658aad30e26dcf47cf35432bca09202' 
  AND token = 'nwSmh9+oYjPrA8FgUH/75bFsRwqGsWKnhlHl/HMF6ug=' 
  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"
    }
  }
}