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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b18464cfd9faef267d4ee7ab5f2adad84592b172b88724755d79a53a88c2a5' 
  AND token = '2JokitF0aK+0e96QYBVi+ktWiHGAcB9DQIkuq7pDDP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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