SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45048983392570e863c71c1818d00d051da0d1f534b9f681651b8122bf1cd13' 
  AND token = 'gBMWG22lhYwaQGKlVOS42O/MvAb+cskQYlfN3qbFP7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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