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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca04673a5dfecabf2f96d12cc27a4e095fc4300a2392de728295b05684d2d99' 
  AND token = 'u+Bs03kw+J0r6cDuZSHYsAtmgmDqbmFa143wSt9Osek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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