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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7932a8cbbcdc0477a2a5c1be2c8ce6fc77458839d7e206fb7942ce2d73e1a78c' 
  AND token = '5Iy3BZC6HyI22Ags9iWIOeN8bagIaDzIcBi1y8BmBVc=' 
  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"
    }
  }
}