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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a159ef1e23b225a947e7073d84e771bf371e71dba202c2eb1d39c5f4a6eaa5' 
  AND token = 'L0dzAg625uGgqorZ0fi4PHZCaQzx3WWth/OM8tKqrM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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