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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a03d0c13b911bdceb563a747277d87d0cdcdc054054843ed8db434acfa3af75' 
  AND token = 'D3O5ZALNil7hUOZMAmz/3xobC4lp3H2g4glV7Vg/jZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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