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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22b68ac7343f49d7c36d65cbab3397b90d5e6e2dc8a8b37bf05f4fb53323f9d2' 
  AND token = '13v87A05zxMaqFe12lx3Za39uzM2ltmpsFlzKX93Lrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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