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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ea92b89063224054c76fe8d9bf2e6ea81229f65b3302fdbe972865f415bf7b' 
  AND token = '/U8E88iJ7U5SY0PLZMl9/GWi8lZyIKecwX/t7Ntfbps=' 
  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"
    }
  }
}