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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1588274d667b6368ca83dcc2c0f4bf8f752e7e984874d7fe1689f93182ddfce9' 
  AND token = 'QtzMbgiNyuk0ChD/9hNHpVAYniSBJe4e6za9M2dVLXk=' 
  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"
    }
  }
}