SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb08547157985517dcdf3a73d20e739451de14db6bc9b296124031023a26ece9' 
  AND token = 'wx+zKhtB3BfOQJQeGlN/sRjJcayLGBjqHyolGvB/cgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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