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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc0adb25131c2b5b2147d9e2490a5a47041a407f9b056fc3931c56bfa4b03ff' 
  AND token = '9JHKUtOrvTx0NBYK4IZ65ow91KAbvrkfNPe5L/nm4q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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