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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdc1c1bfa988bb36ac64115e7cca1d40e4f5351dcf03f4e46084ace23b00cdc' 
  AND token = '8jmt0YBCPg/3SN05O3q2GaYmJGQTywHqngoU5pFTA7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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