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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d38fce43f32b01eda8b01a158949d468db4c702a5adf3d292624b0b0ff54302' 
  AND token = 'S6PQHdXqK/bzOQt1Pe9mhzNe9/CIaRZr6HktsFbEypA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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