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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256aef4202ee35fca53814cd9b9262ce2db1370a514e82603a677093ed297ebe' 
  AND token = '3x+3oBcHpCFWB/tISzlNC07NTvTGjt4E5CgEDLyNup0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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