Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeea288e2bab8491938e23b33f2834106d6755d010d506c2342bafbef3329d2b' 
  AND token = '/thwsVx5eeVZd8udGT5lOjX0ufM+ecvQM2AaOmUiPh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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